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Engine-Codes – Generic – B305E

B305E Code - Interruptible RAP Relay Circuit

Quick Answer

The B305E diagnostic trouble code (DTC) refers to an issue with the Interruptible Retained Accessory Power (RAP) relay circuit in a vehicle. Common causes include Faulty interruptible RAP relay, Wiring issues or loose connections in the relay circuit, Corrosion or damage to the relay circuit components. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B305E indicates Interruptible RAP Relay Circuit.
Common causes
Common causes include Faulty interruptible RAP relay, Wiring issues or loose connections in the relay circuit, Corrosion or damage to the relay circuit components.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code B305E Description

The B305E diagnostic trouble code (DTC) refers to an issue with the Interruptible Retained Accessory Power (RAP) relay circuit in a vehicle. The RAP system allows certain electrical components, such as power windows, radio, and interior lights, to remain operational for a short period after the ignition is turned off or until a door is opened. The interruptible RAP relay is responsible for controlling this function.

OBDII Code B305E - Interruptible RAP Relay Circuit
B305E Code - Interruptible RAP Relay Circuit

Common Causes of B305E

  1. Faulty interruptible RAP relay.
  2. Wiring issues or loose connections in the relay circuit.
  3. Corrosion or damage to the relay circuit components.
  4. Electrical system malfunctions.
  5. Issues with the vehicle's body control module.

Symptoms of B305E

  1. Power windows, radio, or interior lights not working properly.
  2. Accessories losing power shortly after the ignition is turned off.
  3. Battery draining faster than usual.
  4. Door chime not sounding when the key is in the ignition and the door is open.
  5. Check engine light illuminated on the dashboard.

How to Fix B305E

  1. Begin by conducting a thorough inspection of the interruptible RAP relay circuit to identify any visible damage or loose connections.
  2. Test the interruptible RAP relay using a multimeter to determine if it is functioning correctly.
  3. Replace the interruptible RAP relay if it is found to be faulty.
  4. Check and repair any damaged wiring or connections in the relay circuit.
  5. Clear the DTC and test the vehicle to ensure that the issue has been resolved.

Cost to Fix B305E

The typical repair costs for addressing the B305E code can vary depending on the specific vehicle make and model, as well as the location and labor rates of the auto repair shop. On average, the parts for this repair may cost between $50 to $150, while the labor charges could range from $100 to $200. It's advisable to contact local auto repair shops for a more accurate estimate based on your vehicle's requirements. Keep in mind that additional diagnostic time may be needed to pinpoint the exact cause of the issue, which could affect the overall repair costs.

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Code B305E Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B305E Code

1. What does the OBDII code B305E mean?

B305E indicates an issue with the Interruptible Retained Accessory Power (RAP) Relay Circuit, often related to power supply problems for retained accessory systems.

2. What are the common symptoms of code B305E?

Symptoms include accessories like the radio, power windows, or sunroof not functioning after the ignition is turned off, or they may shut off unexpectedly.

3. What causes the B305E code?

Common causes include a faulty RAP relay, damaged wiring or connectors in the RAP circuit, or a problem with the Body Control Module (BCM).

4. Can a weak battery cause the B305E code?

Yes, a weak or failing battery can disrupt the RAP system's operation and potentially trigger the B305E code.

5. How do you diagnose the B305E code?

Diagnosis involves inspecting the RAP relay, checking for damaged or corroded wiring, testing the BCM, and verifying system voltages.

6. Can the B305E code cause other electrical issues?

Yes, it may lead to broader issues with retained accessory systems or intermittent electrical malfunctions in the vehicle.

7. How can I fix the B305E code?

Repairs may include replacing the RAP relay, repairing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the Body Control Module.

8. Is it safe to drive with the B305E code?

Generally, the vehicle can still be driven, but you may experience inconvenience due to non-functional accessories. Prompt repair is recommended.

9. How much does it cost to fix the B305E code?

Repair costs vary but typically range from $50 to $250, depending on whether the problem is with the relay, wiring, or BCM.

10. Can a DIYer fix the B305E code?

Yes, if you have basic tools and electrical knowledge, you can check the relay and wiring. However, BCM-related issues may require professional assistance.

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